A deficiency of O III in the Io plasma torus

Details A deficiency of O III in the Io plasma torus A deficiency of O III in the Io plasma torus

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...264..309b&link_type=abstract

Astrophysical Journal, Part 1, vol. 264, Jan. 1, 1983, p. 309-323.

Astronomy and Astrophysics

Astrophysics

41

Io, Oxygen Plasma, Plasma Spectra, Space Plasmas, Toroidal Plasmas, Chemical Reactions, Kinetic Energy, Line Spectra, Plasma Loss, Toruses, Jupiter, Satellites, Io, Plasma Torus, Oxygen, Abundance, Concentration, Ions, Reactions, Theoretical Studies, Models, Calculations, Partitioning, Observations, Kinetic Energy, Distribution, Intensity, Comparisons, Data, Data Reduction, Spectrography, Parameters, Surface, Brightness, Density, Photometry, Wavelengths, Production Rates, Charged Particles, Ionization, Diff

Scientific paper

Evidence for a deficiency of O III ions in the Io plasma torus is reported and implications of this deficiency for the physical processes controlling the plasma are considered. Observations of the O III 5007-A as well as Cl III and S III emissions from the Io plasma torus were made by a ground-based echelle spectrograph and intensified Reticon detector in February and May, 1981. The O III observations allow an upper limit of 4/cu cm to be placed on torus O III abundance, which is inconsistent with expectations for a low density plasma controlled by electron collisions. The inclusion of ion-ion and ion-atom charge exchange reactions and a depleted high energy electron component in the model is found to suppress O III levels, however observed limiting values are only achieved if it is assumed that the O III is kinetically hot. In addition, the charge-exchange model developed is inconsistent with previous observations of the kinetics of the S II-S III system. The present observations also establish upper limits of 2 R on 5518-A and 5538-A Cl III emission, and an emission rate of 58 + or - 40 R for the S III 6312-A line in the hot torus.

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